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| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB用户手册 (V0.8.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>0-开始使用</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>1-概述</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>2-基本概念</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>3-操作指南</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>4-系统部署与管理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>5-IoTDB SQL文档</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>6-JDBC API</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>7-TsFile</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/UserGuide/V0.8.x/7-TsFile/1-Installation.html" class="sidebar-link">安装</a></li><li><a href="/zh/UserGuide/V0.8.x/7-TsFile/2-Usage.html" class="sidebar-link">用法</a></li><li><a href="/zh/UserGuide/V0.8.x/7-TsFile/3-Hierarchy.html" aria-current="page" class="active sidebar-link">TsFile层次结构</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>8-系统工具</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="tsfile层次结构"><a href="#tsfile层次结构" class="header-anchor">#</a> TsFile层次结构</h1> <p>这是TsFile文件结构的简要介绍。</p> <h1 id="可变存储"><a href="#可变存储" class="header-anchor">#</a> 可变存储</h1> <ul><li><p><strong>Big Endian</strong> |
| </p> <ul><li>例如，<code>int</code> <code>0x8</code>将被存储为<code>00 00 00 08</code>，而不是<code>08 00 00 00</code>。</li></ul></li> <li><p><strong>可变长度的字符串</strong></p> <ul><li><p>格式为 <code>int size</code> 加<code>String literal</code>. 大小可以为零。</p></li> <li><p>大小等于此字符串将占用的字节数，并且可能不等于该字符串的长度。</p></li> <li><p>例如，“ sensor_1”将被存储为<code>00 00 00 08</code>加上“ sensor_1”的编码（ASCII）。</p></li> <li><p>请注意，对于“魔术字符串”（文件签名）“ TsFilev0.8.0”，大小（12）和编码（ASCII）是固定的，因此无需在该字符串文字前放置大小。</p></li></ul></li> <li><p><strong>数据类型硬编码</strong></p> <ul><li>0: BOOLEAN</li> <li>1: INT32 (<code>int</code>)</li> <li>2: INT64 (<code>long</code>)</li> <li>3: FLOAT</li> <li>4: DOUBLE</li> <li>5: TEXT (<code>String</code>)</li></ul></li> <li><p><strong>编码类型硬编码</strong></p> <ul><li>0: PLAIN</li> <li>1: PLAIN_DICTIONARY</li> <li>2: RLE</li> <li>3: DIFF</li> <li>4: TS_2DIFF</li> <li>5: BITMAP</li> <li>6: GORILLA</li> <li>7: REGULAR</li></ul></li> <li><p><strong>压缩类型硬编码</strong></p> <ul><li>0: UNCOMPRESSED</li> <li>1: SNAPPY</li></ul></li></ul> <h1 id="tsfile概述"><a href="#tsfile概述" class="header-anchor">#</a> TsFile概述</h1> <p>这是有关TsFile结构的图。</p> <p><img src="https://user-images.githubusercontent.com/40447846/61616997-6fad1300-ac9c-11e9-9c17-46785ebfbc88.png" alt="TsFile Breakdown"></p> <h1 id="魔术字符串"><a href="#魔术字符串" class="header-anchor">#</a> 魔术字符串</h1> <p>有一个12个字节的魔术字符串：</p> <p><code>TsFilev0.8.0</code></p> <p>它在TsFile文件的开头和结尾都作为签名。</p> <h1 id="数据"><a href="#数据" class="header-anchor">#</a> 数据</h1> <p>TsFile文件的内容可以分为两部分：数据和元数据。 数据和元数据之间有一个字节“ 0x02”作为标记。</p> <p>数据部分是<code>ChunkGroup</code>的数组，每个ChuckGroup代表一个* device *。</p> <h3 id="chuckgroup"><a href="#chuckgroup" class="header-anchor">#</a> ChuckGroup</h3> <p><code>ChunkGroup</code>具有一个<code>Chunk</code>数组，一个后继字节<code>0x00</code>作为标记以及一个<code>ChunkFooter</code>。</p> <h4 id="chunk"><a href="#chunk" class="header-anchor">#</a> Chunk</h4> <p><code>Chunk</code>代表<em>传感器</em>。 在<code>ChunkHeader</code>和<code>Page</code>数组之后，有一个字节<code>0x01</code>作为标记。</p> <h5 id="chunkheader"><a href="#chunkheader" class="header-anchor">#</a> ChunkHeader</h5> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>The name of this sensor(measurementID)</td><td>String</td></tr> <tr><td>Size of this chunk</td><td>int</td></tr> <tr><td>Data type of this chuck</td><td>short</td></tr> <tr><td>Number of pages</td><td>int</td></tr> <tr><td>Compression Type</td><td>short</td></tr> <tr><td>Encoding Type</td><td>short</td></tr> <tr><td>Max Tombstone Time</td><td>long</td></tr></table></center> <h5 id="page"><a href="#page" class="header-anchor">#</a> Page</h5> <p><code>Page</code>代表<code>Chunk</code>中的一些数据。 它包含一个<code>PageHeader</code>和实际数据（编码的时间值对）。</p> <p>PageHeader结构</p> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Data size before compressing</td><td>int</td></tr> <tr><td>Data size after compressing(if use SNAPPY)</td><td>int</td></tr> <tr><td>Number of values</td><td>int</td></tr> <tr><td>Minimum time stamp</td><td>long</td></tr> <tr><td>Maximum time stamp</td><td>long</td></tr> <tr><td>Minimum value of the page</td><td>Type of the page</td></tr> <tr><td>Maximum value of the page</td><td>Type of the page</td></tr> <tr><td>First value of the page</td><td>Type of the page</td></tr> <tr><td>Last value of the page</td><td>Type of the page</td></tr> <tr><td>Sum of the Page</td><td>double</td></tr></table></center> <h5 id="chunkgroupfooter"><a href="#chunkgroupfooter" class="header-anchor">#</a> ChunkGroupFooter</h5> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Deviceid</td><td>String</td></tr> <tr><td>Data size of the ChunkGroup</td><td>long</td></tr> <tr><td>Number of chunks</td><td>int</td></tr></table></center> <h1 id="元数据"><a href="#元数据" class="header-anchor">#</a> 元数据</h1> <h2 id="tsdevicemetadata"><a href="#tsdevicemetadata" class="header-anchor">#</a> TsDeviceMetaData</h2> <p>元数据的第一部分是<code>TsDeviceMetaData</code></p> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Start time</td><td>long</td></tr> <tr><td>End time</td><td>long</td></tr> <tr><td>Number of chunk groups</td><td>int</td></tr></table></center> <p>然后在<code>TsDeviceMetaData</code>之后有一个<code>ChunkGroupMetaData</code>数组。</p> <h2 id="chunkgroupmetadata"><a href="#chunkgroupmetadata" class="header-anchor">#</a> ChunkGroupMetaData</h2> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Deviceid</td><td>String</td></tr> <tr><td>Start offset of the ChunkGroup</td><td>long</td></tr> <tr><td>End offset of the ChunkGroup</td><td>long</td></tr> <tr><td>Version</td><td>long</td></tr> <tr><td>Number of ChunkMetaData</td><td>int</td></tr></table></center> <p>然后，每个<code>ChunkGroupMetadata</code>都有一个<code>ChunkMetadata</code>数组。</p> <h4 id="chunkmetadata"><a href="#chunkmetadata" class="header-anchor">#</a> ChunkMetaData</h4> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Measurementid</td><td>String</td></tr> <tr><td>Start offset of ChunkHeader</td><td>long</td></tr> <tr><td>Number of data points</td><td>long</td></tr> <tr><td>Start time</td><td>long</td></tr> <tr><td>End time</td><td>long</td></tr> <tr><td>Data type</td><td>short</td></tr> <tr><td>Number of statistics</td><td>int</td></tr> <tr><td>The statistics of this chunk</td><td>TsDigest</td></tr></table></center> <h5 id="tsdigest"><a href="#tsdigest" class="header-anchor">#</a> TsDigest</h5> <p>有五个统计信息： <code>min, last, sum, first, max</code></p> <p>存储格式是名称/值对。 名称是一个字符串（记住长度在文字之前）。</p> <p>但是对于该值，即使不是字符串，在数据前也有一个大小整数。 例如，如果<code>min</code>为3，则它将被存储为3“ min” 4 3在TsFile中。</p> <h3 id="file-metadata"><a href="#file-metadata" class="header-anchor">#</a> File Metadata</h3> <p>在<code>ChunkGroupMetadata</code>数组之后，这是元数据的最后一部分。</p> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Number of Devices</td><td>int</td></tr> <tr><td>Array of DeviceIndexMetadata</td><td>DeviceIndexMetadata</td></tr> <tr><td>Number of Measurements</td><td>int</td></tr> <tr><td>Array of Measurement name and schema</td><td>String, MeasurementSchema pair</td></tr> <tr><td>Current Version(3 for now)</td><td>int</td></tr> <tr><td>Author byte</td><td>byte</td></tr> <tr><td>Author(if author byte is 0x01)</td><td>String</td></tr> <tr><td>File Metadata size(not including itself)</td><td>int</td></tr></table></center> <h4 id="deviceindexmetadata"><a href="#deviceindexmetadata" class="header-anchor">#</a> DeviceIndexMetadata</h4> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Deviceid</td><td>String</td></tr> <tr><td>Start offset of ChunkGroupMetaData(Or TsDeviceMetaData if it's the first one)</td><td>long</td></tr> <tr><td>length</td><td>int</td></tr> <tr><td>Start time</td><td>long</td></tr> <tr><td>End time</td><td>long</td></tr></table></center> <h4 id="measurementschema"><a href="#measurementschema" class="header-anchor">#</a> MeasurementSchema</h4> <center><table style="text-align:center;"><tr><th>Member Description</th><th>Member Type</th></tr> <tr><td>Measurementid</td><td>String</td></tr> <tr><td>Data type</td><td>short</td></tr> <tr><td>Encoding</td><td>short</td></tr> <tr><td>Compressor</td><td>short</td></tr> <tr><td>Size of props</td><td>int</td></tr></table></center> <p>如果道具的大小大于0，则存在一个<String，String>对数组，作为此度量的属性。 |
| 例如“ max_point_number”“ 2”。</p> <h1 id="完成"><a href="#完成" class="header-anchor">#</a> 完成</h1> <p>在<code>FileMetaData</code>之后，将有另一个魔术字符串，您已经完成了发现TsFile的旅程！</p> <p>您也可以使用/ tsfile / example / TsFileSequenceRead来读取和验证TsFile。</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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